Of course reviews matter. That’s easy and predictable enough for someone writing a review to say, but it can be proven. Reviews matter in two ways: as filters, and as shapers of opinion. In his 1991 book, U & I, Nicholson Baker describes “book reviews, not books” as “the principal engines of change in the history of thought”; because no one has time to read all the books they want to, reviews must sometimes stand in for the thing itself. The more contentious point, about influence, can be divided into two questions: do they influence and if so is that influence beneficial or malign?